Modeling Horizontal Drop Structure in HEC-RAS
Modeling Horizontal Drop Structure in HEC-RAS
(OP)
I have an inline structure with a horizontal drop structure located near the top that enters a culvert that transports flow through the structure. I am trying to model this structure to determine upstream w.s. elevation, but do not have any idea how to enter the horizontal grated inlet in HEC-RAS. Any ideas?





RE: Modeling Horizontal Drop Structure in HEC-RAS
http://www.ecy.wa.gov/programs/wr/dams/guide.html
and scroll down to drop inlets.
Once you have the stage - discharge info you should be able to set it up in RAS for downstream routing. Hope that helps you.
RE: Modeling Horizontal Drop Structure in HEC-RAS
RE: Modeling Horizontal Drop Structure in HEC-RAS
I'm familiar with steady flow analysis using HEC-RAS, and have modeled streams with multiple obstructions (bridges, culverts, etc.) but never with a detention pond (which I'm assuming is modeled as a "reservoir"). I can develop a stage/elevation - discharge table rating curve using other software, but where do i go from there?
RE: Modeling Horizontal Drop Structure in HEC-RAS
RE: Modeling Horizontal Drop Structure in HEC-RAS
1) Routing the basin yields that the 100-year storm overtops the basin, thus I don't have an accurate max WSEL.
2) How do I model the entire steady state model in HEC-RAS? Do I model the pond as a reservoir or just cross-sections within the model? And if a reservoir, how do I connect to the downstream?